Methods for pick and put location verification

ABSTRACT

The present application discloses methods to reliably verify pick locations in a warehouse, with minimal or no interaction by the user. Once verified, the user can proceed to pick-up a product or deliver a product to the pick location. In one embodiment, the user may wear binocular augmented reality headset. The headset renders a hologram that is viewed by the user. Aided by the hologram and depth sensing capabilities of the headset that confirms a pick location without any user interaction, the user may be able to reliably verify pick locations and select the correct product. In another embodiment, the user may wear haptic feedback gloves. The gloves comprise force sensors, actuators and a wireless interface. The forces sensors may determine whether the user is holding the product and a location system may determine whether the user is in proximity to the correct pick location.

FIELD OF THE INVENTION

The present invention relates to the identification of a product at a location. More particularly, the present invention relates to the accurate “picking” and “putting” of a product in a warehouse.

BACKGROUND

Generally speaking, during order fulfillment operations in a warehouse, such as picking and stocking product, a common source of inaccuracy is caused by a picker/stocker picking/placing a product at an incorrect location. Some systems, such as pick to voice, may address this by requiring the picker to read a confirmation code that is printed at each location to verify that they are in fact at the correct spot, picking the correct part. This solution, however, may be fallible as it may be common for the pickers to memorize these confirmation codes and speak back the correct code to the system while picking/placing the incorrect product. Another method of confirming a pick location includes scanning a barcode, which may be time consuming and may require a physical device.

Therefore, a need exists for a method for pickers and stockers to accurately and efficiently verify the selection of the product in a warehouse.

SUMMARY

Accordingly, in one aspect, the present invention embraces methods to reliably verify pick locations in a warehouse, with minimal or no interaction by the user. Once verified, the user can proceed to retrieve or pick-up a product at the pick location or deliver a product to the pick location.

In an exemplary embodiment, a method of verifying a location of a product in a warehouse comprises: receiving, by a headset, a notification to retrieve (i.e., message to pick-up) or deliver a product at a pick location; moving, by the headset with the user, in proximity to the pick location; rendering, by the headset, a hologram representing the pick location, wherein, the user views the hologram. In response to determining that the user is looking in a direction of the hologram and determining that the user is within a distance threshold of the pick location, providing, by the headset, a positive indicator to the user. In response to determining that the user is not looking in the direction of the hologram or determining that the user is not within a distance threshold of the pick location, providing, by the headset, a negative indicator to the user.

The method further comprises determining, by the headset, the direction the user is looking by querying an inertial measurement unit (IMU). The IMU comprises a three axis accelerometer, a three axis gyroscope, and a three axis magnetometer. A location of the user is determined utilizing a location positioning system. The location positioning system comprises one or more of the following: GPS, RF based indoor positioning, and visual simultaneous localization and mapping (SLAM) algorithms. The method further comprises determining, by the headset, a distance to a surface on a three dimensional basis by analyzing depth sensor data, wherein, the headset comprises depth sensors. The surface comprises the pick location. The depth sensors spatially map, on a continuous and three dimensional basis, an environment in proximity to the headset. The positive indicator, the negative indicator, and, the notification to retrieve or deliver the product comprises one or more visual, audible, or haptic alerts.

In another exemplary embodiment, a method of verifying a location of a product in a warehouse comprises: receiving, by a headset, a notification to retrieve or deliver a product at a pick location; moving, by the headset with a user, in proximity to the pick location; rendering, by the headset, a hologram representing the pick location, wherein, the user views the hologram; and based in part on a gaze direction of the user relative to the hologram, sending, by the headset, an indication to the user whether the pick location is the location of the product. The indication approves the user to pick-up or deliver the product if the user is gazing in a direction towards the hologram and the user is within a distance threshold of the pick location. The indication does not approve the user to pick-up or deliver the product if the user is not gazing in a direction towards the hologram or if the user is not within a distance threshold of the product location.

The method further comprises a determination whether the user is looking in a direction of the hologram and the user is within a distance threshold of the pick location is based on one or more of the following: (1) a location of the hologram rendered by picking software, wherein the location is provided in three dimensional coordinates; (2) a location of the user, determined by a positioning system; (3) a distance to any surface, determined by analyzing depth sensor data; and (4) a direction that the user is looking by querying an inertial measurement unit (IMU) that is located in the headset.

The method further comprises spatially mapping, by the headset on a continuous and three dimensional basis, an environment in proximity to the headset utilizing depth sensors located on the headset.

In yet another exemplary embodiment, a method of verifying a location of a product in a warehouse comprises receiving, by a device, a notification to retrieve or deliver a product at a pick location; moving, by the device, in proximity to the pick location, wherein a user attempts to retrieve or pick-up the product wearing haptic feedback gloves; receiving, by the device, force data from force sensors on the haptic feedback gloves based on whether the user is holding the product with the haptic feedback gloves; determining, by the device, if the force data is greater than a force threshold; determining, by the device, if the haptic feedback gloves worn by the user are within a distance threshold to the pick location; and in response to determining that the force data is greater than a force threshold, and the haptic feedback gloves worn by the user are within a distance threshold to the pick location, sending, by the device, a positive indicator to actuators of the haptic feedback gloves to alert the user to retrieve (i.e., pick-up) or deliver the product. The haptic feedback gloves comprise a wireless interface, e.g. Bluetooth Low Energy (LE).

The method further comprises: (1) in response to determining that the force data is greater than a force threshold, and the haptic feedback gloves worn by the user are not within a distance threshold to the pick location, sending, by the device, a negative indicator to activate actuators on the haptic feedback gloves and direct the user to not pick-up or not deliver the product; (2) in response to determining that the force data is not greater than a force threshold, moving again, by the device, in proximity to the pick location, wherein a user attempts to pick-up the product wearing the haptic feedback gloves.

The device controls an activation of the actuators, and programs the actuators to simulate different types of touch sensations. The device receives force data from the sensors on the haptic feedback gloves on a continuous basis. The positive indicator, a negative indicator, and, the notification to retrieve or deliver the product comprises one or more visual, audible, or haptic alerts.

The foregoing illustrative summary, as well as other exemplary objectives and/or advantages of the invention, and the manner in which the same are accomplished, are further explained within the following detailed description and its accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an exemplary embodiment of haptic feedback gloves capable of detecting when the user is holding a product.

FIG. 2 illustrates an exemplary embodiment a user wearing binocular augmented reality headset in a warehouse environment.

FIG. 3 illustrates an exemplary flowchart of a method for a user to verify the selection of a product based on the utilization of binocular augmented reality headset.

FIG. 4 illustrates an exemplary flowchart of a method for a user to verify the selection of a product based on the utilization of haptic feedback gloves.

DETAILED DESCRIPTION

The present invention embraces methods to reliably verify pick locations in a warehouse, with minimal or no interaction by the user. Once verified, the user can proceed to retrieve (i.e., pick-up) a product or deliver a product to the pick location. That is, the method can help a user verify that they are in the correct location before a pick/stock operation can occur. For this discussion the term “product” is synonymous with the term “object” and the term “item”. Also, the term “Hololens” is one embodiment of a “headset” suitable for implementing an embodiment of the present invention.

One exemplarily method utilizes a binocular augmented reality headset equipped with depth sensing capabilities that can confirm a pick location without any user interaction. Binocular augmented reality headsets, such as the Microsoft Hololens, have the ability to render three dimensional (3D) graphics in the user's field of view so that it appears as if the objects are actually in the room with the user. This user view is created by rendering two different views of a scene to each of the user's eyes. This induced parallax tricks the brain into thinking the rendered objects are three dimensional. In addition, the Hololens is equipped with (1) several depth sensors that can spatially map the user's environment in (near) real-time, and (2) a 9 axis inertial measurement unit (IMU) capable of tracking the users gaze direction. The binocular augmented reality headset may include a wireless interface, e.g. Bluetooth Low Energy (LE) or IEEE 802.11.

The present invention uses these features to confirm (or verify) that the user is picking (or delivering) the correct item. A user (or picker), wearing the Hololens, is instructed to pick a product at a particular bin location. The user may see a glowing green box around the pick location (See FIG. 2). As the user navigates to the pick location, the depth sensors may continuously spatially map the environment. The Hololens (1) knows the location (three coordinates) of the green hologram rendered by the picking software, (2) knows the location of the picker by utilizing a simultaneous localization and mapping (SLAM) algorithm, (3) knows the distance to this hologram by analyzing the depth sensor data, and (4) knows the direction that the user is looking by querying the IMU. In robotic mapping, simultaneous localization and mapping (SLAM) is the computational problem of constructing or updating a map of an unknown environment while simultaneously keeping track of an agent's location within it.

With the aforementioned information, the software may determine if the user is looking in a direction at the hologram (i.e. the correct pick location) and is physically close to the hologram, i.e. the pick location. If the user is looking in the direction of the hologram and is within a distance threshold (n feet) of the hologram, the software may allow the pick operation to continue. However, if an active pick is in progress and the picker is not looking in a direction at the hologram, the software may notify them that they are picking an incorrect product. This notification could be done visibly, audibly and/or haptically. This method may eliminate the use of the procedure to read back a confirmation code, scan a barcode or perform some other type of conscious pick location confirmation that may be time-consuming and not reliable.

The present invention may utilize software for the Hololens that monitors the 9 axis IMU, the spatial mapping, and the location information of the picker. Upon a pick request, the software may use the IMU data to determine the gaze direction of the user and utilize a ray tracing algorithm to determine if their gaze intersects the 3D hologram associated to the current pick location. The software knows the 3D coordinates of the headset, the direction the headset is looking and the 3D coordinates of the pick location hologram. Additionally, the software may monitor the distance to any surface using the depth sensor data. If the ray trace determines that the user was NOT gazing at the hologram (i.e. the correct pick location) and the user (Hololens) is within a distance threshold, n feet (e.g. 2 ft) from a surface, the software may visibly show a warning to the user instructing the user that they are picking the wrong product. The instruction or indicator may also be an audibly alert and or haptically alert for the user. If the ray trace determined that the user is gazing at the hologram and the user is within a distance threshold, n feet (e.g. 2 ft) from the hologram, the hologram may disappear so that the hologram does not distract the user during the pick operation. A success sound/graphic could also indicate that the correct pick location has been confirmed.

Another exemplarily method utilizes ahaptic feedback gloves capable of detecting when the user is holding an object, and capable of acquiring location information of the user, and capable of receiving indicators whether the user is at the correct pick location.

This method proposes the development and/or use of a pair of gloves that are capable of detecting when an object is held in the pickers hands. These gloves can wirelessly relay this information back to an edge device (e.g. smartphone, personal data terminal (PDT), etc.). The “edge device” may be referred to as a “device”. FIG. 1 illustrates an embodiment of haptic feedback gloves 100. Haptic feedback gloves 100 may comprise (1) actuators 102, including 1 per fingertip and several in the palm of the hand, force sensors 104 with 1 force sensor per fingertip, and (3) mainboard 106 including a battery and Bluetooth Low Energy (LE) wireless interface.

The actuators 102 may be controlled by a connected edge device. The actuators 102 may create a buzzing sensation and may be embedded within each fingertip and/or the palm of the glove. The buzz intensity of each actuator 102 may be controlled by the edge device, allowing it to simulate different types of touch sensations. Haptic feedback gloves 100 may have a mainboard 106, RF radio (e.g. Bluetooth LE), battery and other circuitry embedded within the top and/or around the wrist of the glove (See FIG. 1).

The edge device may be aware of its location via an indoor positioning system. During a pick operation the software will instruct the picker to move to a particular pick location. The software may monitor the real time position of the picker and may know the pick location of the active pick. If the software receives data from the force sensors 104 of the haptic feedback gloves 100 commensurate with holding an object and the picker is not in the correct pick location, the software will send a command to the haptic feedback gloves 100 instructing the actuators 102 to begin buzzing. The actuators 102 alert the user that they are picking an incorrect product. This method may prevent the user from utilizing the method of reading back a confirmation code, scanning a barcode or performing some other type of conscious pick location confirmation that may ultimately wastes time and may be unreliable.

This method may be implements via a pair of haptic feedback gloves 100 with the features shown in FIG. 1 and the aforementioned capabilities. These haptic feedback gloves 100 may have a Bluetooth Low Energy peripheral and utilize standard Generic Attribute Profile (GATT) services to control the actuators 102 and query force sensor data. A smart device worn/carried by the picker may run the picking business logic. During an active pick operation the edge device may create a connection to each haptic feedback glove 100 and request constant updates from the force sensors 104. Software on the smart device may be continuously updated of the picker's position and may compare the picker's position to the position of the pick location while calculating the picker's distance to the pick location.

If the edge device begins receiving force data from several force sensors 104 at once, indicating a significant level of force, the edge device software may check the picker's current distance to the pick target. If the distance is greater than a distance threshold, n feet (e.g. 5 ft), the edge device may send commands to each haptic feedback glove 100 instructing them to buzz the actuators 102. This alerts the picker that the incorrect product is in their hands. If the distance is less than a distance threshold, n feet (e.g. 5 ft), the pick operation may continue without any buzzing of the actuators 102. This method validates the pick location and may be applicable for Internet of Things (IoT) applications.

In an exemplary embodiment, FIG. 3 illustrates an exemplary flowchart 300 of a method for a user to verify the selection of a product based on the utilization of binocular augmented reality headset. The method comprises the following steps, at a binocular augmented reality headset worn by a user:

Receiving a notification to retrieve (i.e., a message to pick-up) or deliver a product at a pick location. (step 302)

Moving with a user in proximity to the pick location. (step 304)

Rendering a hologram representing the pick location, and the user views the hologram. (step 306)

Is the user looking in the direction of the hologram? (step 308)

If the user is looking in the direction of the hologram, is the user within a distance threshold of the pick location? (step 310)

If yes, providing a positive indicator to the user to pick-up or deliver the product at the pick location, and displaying the pick quantity within the hologram. (step 312)

If the user is not looking in the direction of the hologram (step 308), or if is the user is not within a distance threshold of the pick location (step 310), providing a negative indicator to the user to not pick-up or deliver the product at the pick location (step 314) A negative indicator may cause the actuators to buzz.

In an exemplary embodiment, FIG. 4 illustrates an exemplary flowchart 400 of a method for a user to verify the selection of a product based on the utilization of haptic feedback gloves. The method comprises the following steps, at an edge device of a user:

Receiving a notification to retrieve (i.e., a message to pick-up) or deliver a product at a pick location. (step 402)

Moving in proximity to the pick location where the user attempts to pick-up the product wearing haptic feedback gloves. (step 404)

Receiving force data from sensors on the haptic feedback gloves. (step 406)

Is the force data greater than a force threshold? (step 408)

If yes, are the haptic feedback gloves within a distance threshold to the pick location? (step 410)

If yes, providing a positive indicator to the user to pick-up the product at the pick location. (step 412)

If the force data is not greater than a force threshold, the picker may not be holding the product. (Step 408) The method then returns to repeat step 404.

If the force data is greater than a force threshold, and if the haptic feedback gloves are not within a distance threshold to the pick location, providing a negative indicator to the user to not pick-up or deliver the product at the pick location. (steps 408, 410, 414) A negative indicator may cause the actuators to buzz.

The methods, described herein, may be implemented via cloud computing rather than a device such as a mobile phone.

If the user navigates to a wrong location, the user would be informed of this status via visible, audible and/or haptic feedback. The user would not be able to proceed with the operation (e.g., not informed of the pickup quantity) until the correct location is verified. For the embodiment where the user is utilizing a headset, the hologram presents a “real” image that is viewed by the user of the headset.

To supplement the present disclosure, this application incorporates entirely by reference the following commonly assigned patents, patent application publications, and patent applications:

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In the specification and/or figures, typical embodiments of the invention have been disclosed. The present invention is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation. 

The invention claimed is:
 1. A method, comprising: receiving, with a headset, a notification to retrieve or deliver a product at a pick location in a physical environment; detecting, with the headset, that the headset is within a first distance threshold from the pick location; rendering, with the headset, a hologram representing the pick location in the physical environment, wherein the hologram is superimposed by the headset on a field of view of a user associated with the headset in the physical environment; determining that a gaze direction of the user associated with the headset overlaps the hologram; comparing a distance between the user and the pick location with a second distance threshold; and based at least in part on the gaze direction of the user overlapping the hologram and the distance between the user and the pick location is within the second distance threshold, sending, by the headset, an indication to the user that the pick location is a correct product location, in response to sending the indication to the user, removing the hologram from the field of view of the user.
 2. The method according to claim 1, wherein the indication corresponds to an approval to the user to retrieve or deliver the product based on the gaze direction of the user towards the hologram and the distance between the user and the pick location is within the second distance threshold.
 3. The method according to claim 1, wherein the indication corresponds to a disapproval to the user to retrieve or deliver the product based on the gaze direction of the user away from the hologram or the distance between the user and the pick location is not within the second distance threshold.
 4. The method according to claim 1, further comprising determining that the gaze direction of the user is towards the hologram and the user is within the second distance threshold of the pick location based on one or more of: a location of the hologram rendered by picking software, wherein the location of the hologram is provided in three dimensional coordinates; a location of the user, determined by a positioning system; a distance to any surface, determined by analyzing depth sensor data; and querying an inertial measurement unit (IMU) located in the headset.
 5. The method according to claim 4, wherein the picking software utilizes the inertial measurement unit (IMU) data and a ray tracing algorithm to determine if the gaze direction of the user overlaps the hologram associated with the pick location.
 6. The method according to claim 1, further comprising spatially mapping, with the headset on a continuous and three dimensional basis, the physical environment in proximity to the headset utilizing depth sensors located on the headset.
 7. The method according to claim 1, wherein both of the indication to the user that the pick location is the correct product location, and the notification to retrieve or deliver the product at the pick location comprises one or more of visual, audible, or haptic alerts.
 8. The method according to claim 1, further comprising sending, by the headset, another indication to the user that the pick location is an incorrect product location when an active pick is in progress and the gaze direction of the user is away from the hologram.
 9. An augmented reality headset device, comprising: one or more processing units configured to: receive a notification to retrieve or deliver a product at a pick location in a physical environment; detect that the augmented reality headset device is within a first distance threshold from the pick location; render a hologram on the augmented reality headset device, wherein the hologram is associated with the pick location in the physical environment; determine that a gaze direction of a user associated with the augmented reality headset device overlaps the hologram; compare a distance between the user and the pick location with a second distance threshold; and based at least in part on the gaze direction of the user overlapping the hologram and the distance between the user and the pick location is within the second distance threshold, send an indication to the user that the pick location is a correct product location; in response to sending the indication to the user, ceasing rendering the hologram.
 10. The augmented reality headset device according to claim 9, wherein the indication corresponds to an approval to the user to retrieve or deliver the product based on the gaze direction of the user towards the hologram and the distance between the user and the pick location is within the second distance threshold.
 11. The augmented reality headset device according to claim 9, wherein the indication corresponds to a disapproval to the user to retrieve or deliver the product based on the gaze direction of the user away from the hologram or the distance between the user and the pick location is not within the second distance threshold.
 12. The augmented reality headset device according to claim 9, wherein the one or more processing units are further configured to determine that the gaze direction of the user is towards the hologram and the user is within the second distance threshold of the pick location based on a location of the hologram rendered by a picking software, wherein the location of the hologram is provided in three dimensional coordinates.
 13. The augmented reality headset device according to claim 12, wherein the picking software utilizes inertial measurement unit (IMU) data and a ray tracing algorithm to determine if the gaze direction of the user overlaps the hologram associated with the pick location.
 14. The augmented reality headset device according to claim 9, wherein the one or more processing units are further configured to determine that the gaze direction of the user is towards the hologram and the user is within the second distance threshold of the pick location based on a location of the user determined by a positioning system.
 15. The augmented reality headset device according to claim 14, wherein the positioning system comprises one or more of a global positioning system (GPS), a radio frequency (RF) based indoor positioning, and visual simultaneous localization and mapping (SLAM) algorithms.
 16. The augmented reality headset device according to claim 9, wherein the one or more processing units are further configured to determine that the gaze direction of the user is towards the hologram and the user is within the second distance threshold of the pick location based on a distance to a surface determined by analyzing depth sensor data.
 17. The augmented reality headset device according to claim 9, wherein the one or more processing units are further configured to determine that the gaze direction of the user is towards the hologram and the user is within the second distance threshold of the pick location based on querying an inertial measurement unit (IMU) that is located in the augmented reality headset device.
 18. The augmented reality headset device according to claim 17, wherein the IMU comprises a three axis accelerometer, a three axis gyroscope, and a three axis magnetometer.
 19. The augmented reality headset device according to claim 9, wherein the one or more processing units are further configured to spatially map the physical environment in proximity to the augmented reality headset device on a continuous and three dimensional basis.
 20. The augmented reality headset device according to claim 9, wherein the indication and the notification to retrieve or deliver the product comprises one or more of visual, audible, or haptic alerts. 